Rich Felker
8312f7f60f
this is the second phase of the "resolver overhaul" project. the key additions in this commit are the __res_msend and __res_mkquery functions, which have been factored so as to provide a backend for both the legacy res_* functions and the standard getaddrinfo and getnameinfo functions. the latter however are still using the old backend code; there is code duplication which still needs to be removed, and this will be the next phase of the resolver overhaul. __res_msend is derived from the old __dns_doqueries function, but generalized to send arbitrary caller-provided packets in parallel rather than producing the parallel queries itself. this allows it to be used (completely trivially) as a backend for res_send. the factored-out query generation code, with slightly more generality, is now part of __res_mkquery.
18 lines
562 B
C
18 lines
562 B
C
#include <resolv.h>
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#include <netdb.h>
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#include "libc.h"
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int __res_mkquery(int, const char *, int, int, const unsigned char *, int, const unsigned char*, unsigned char *, int);
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int __res_send(const unsigned char *, int, unsigned char *, int);
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int __res_query(const char *name, int class, int type, unsigned char *dest, int len)
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{
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unsigned char q[280];
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int ql = __res_mkquery(0, name, class, type, 0, 0, 0, q, sizeof q);
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if (ql < 0) return ql;
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return __res_send(q, ql, dest, len);
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}
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weak_alias(__res_query, res_query);
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weak_alias(__res_query, res_search);
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